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Table 3 Engineering prototype and experimental system design parameters
From: Effect of groundwater forced seepage on heat transfer characteristics of borehole heat exchangers
Classify | Volume x∙y∙z (m3) | Pressure diaphragm thickness σ1 (m) | Confined aquifer (fine sand layer) thickness σ2 (m) | Tube pitch l(m) | Heat transfer rates per unit borehole depth q (W m−1) | Darcy velocity uf (m s−1) | Operation time t |
|---|---|---|---|---|---|---|---|
Prototype | 20 × 16 × 20 | 4 | 12 | 4 | 50 | 1.2 × 10–7 | 90 days |
Test-bed | 1.0 × 0.8 × 1 | 0.2 | 0.6 | 0.2 | 50 | 2.4 × 10–6 | 5.4 h |